<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片示图 -->
    <el-card>
      <el-alert show-icon :closable="false" title="注意：只允许为第三级分类设置相关参数" type="warning"> </el-alert>
      <!-- 选择商品 -->
      <el-row class="cat_opt">
        <el-col>
          <span style="margin-right: 20px">选择商品分类</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            expand-trigger="hover"
            :props="cate_props"
            :options="catelist"
            v-model="selectedKeys"
            @change="cateChanged"
            clearable
          ></el-cascader>
        </el-col>
      </el-row>
    </el-card>
    <!-- tab页签区 -->
    <el-tabs v-model="activeName" @tab-click="tabChanged">
      <el-tab-pane label="动态参数" name="many">
        <el-button @click="showAddDialog" :disabled="isBtnDisable" size="mini" type="primary">添加参数</el-button>
        <!-- 动态参数表格 -->
        <el-table :data="manyTableData" border stripe>
          <el-table-column type="expand">
            <template slot-scope="scope">
              <!-- 循环展示tag标签 -->
              <el-tag closable @close="handleClose(i, scope.row)" v-for="(item, i) in scope.row.attr_vals" :key="i">{{ item }}</el-tag>
              <!-- 添加的输入框 -->
              <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
              >
              </el-input>
              <!-- 添加按钮 -->
              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
            </template>
          </el-table-column>
          <el-table-column type="index"></el-table-column>
          <el-table-column label="参数名称" prop="attr_name"></el-table-column>
          <el-table-column label="操作">
            <template slot-scope="scope">
              <el-button @click="showEditDialog(scope.row.attr_id)" size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
              <el-button @click="removeParamsById(scope.row.attr_id)" size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-tab-pane>
      <el-tab-pane label="静态属性" name="only">
        <el-button @click="showAddDialog" :disabled="isBtnDisable" size="mini" type="primary">添加属性</el-button>
        <!-- 静态参数表格 -->
        <el-table :data="onlyTableData" border stripe>
           <el-table-column type="expand">
            <template slot-scope="scope">
              <!-- 循环展示tag标签 -->
              <el-tag closable @close="handleClose(i, scope.row)" v-for="(item, i) in scope.row.attr_vals" :key="i">{{ item }}</el-tag>
              <!-- 添加的输入框 -->
              <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
              >
              </el-input>
              <!-- 添加按钮 -->
              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
            </template>
          </el-table-column>
          <el-table-column type="index"></el-table-column>
          <el-table-column label="属性名称" prop="attr_name"></el-table-column>
          <el-table-column label="操作">
            <template slot-scope="scope">
              <el-button @click="showEditDialog(scope.row.attr_id)" size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
              <el-button @click="removeParamsById(scope.row.attr_id)" size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-tab-pane>
    </el-tabs>
    <!-- 添加 参数/属性 对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" @close="addDialogClosed" width="50%">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef">
        <el-form-item :label="titleText" label-width="100px" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改 参数/属性 对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" @close="editDialogClosed" width="50%">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef">
        <el-form-item :label="titleText" label-width="100px" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      catelist: [],
      cate_props: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      selectedKeys: [],
      activeName: 'many',
      manyTableData: [],
      onlyTableData: [],
      addDialogVisible: false,
      editDialogVisible: false,
      addForm: {
        attr_name: ''
      },
      editForm: {
        attr_name: ''
      },

      addFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      },
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      }
    }
  },
  computed: {
    isBtnDisable() {
      if (this.selectedKeys.length !== 3) {
        return true
      }
      return false
    },
    cateId() {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[this.selectedKeys.length - 1]
      }
      return null
    },
    titleText() {
      return this.activeName === 'many' ? '动态参数' : '静态属性'
    }
  },
  created() {
    this.getCatelist()
  },
  methods: {
    async getCatelist() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取分类信息失败')
      }
      this.catelist = res.data
    },
    async getParamsData() {
      //   只允许选择三级
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      //   根据所选分类的id和所处的面板获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    async cateChanged() {
      this.getParamsData()
    },
    // 切换面板
    tabChanged() {
      this.getParamsData()
    },
    showAddDialog() {
      this.addDialogVisible = true
    },
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数错误')
        }
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    async showEditDialog(attrId) {
      this.editDialogVisible = true
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数失败')
      }
      this.editForm = res.data
    },
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('更新参数失败')
        }
        this.$message.success('更新参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    async removeParamsById(attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch((e) => e)

      if (confirmResult === 'cancel') {
        return this.$message.info('已取消删除操作')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      this.$message.success('删除参数成功')
      this.getParamsData()
    },
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputVisible = false
        row.inputValue = ''
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    showInput(row) {
      row.inputVisible = true
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 修改的参数保存到数据库
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: this.activeName,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('编辑提交参数失败')
      }
      this.$message.success('修改参数成功')
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  }
}
</script>
<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>